University of Tasmania
Browse
153694 - Patterns of genomic diversity and linkage disequilibrium.pdf (3.85 MB)

Patterns of genomic diversity and linkage disequilibrium across the disjunct range of the Australian forest tree Eucalyptus globulus

Download (3.85 MB)
journal contribution
posted on 2023-05-21, 14:04 authored by Jakob ButlerJakob Butler, Jules FreemanJules Freeman, Bradley PottsBradley Potts, Rene VaillancourtRene Vaillancourt, Kahrood, HV, Ades, PK, Rigault, P, Tibbits, JFG
The evolutionary trajectory of a population both influences and is influenced by characteristics of its genome. A disjunct population, for example is likely to exhibit genomic features distinct from those of continuous populations, reflecting its specific evolutionary history and influencing future recombination outcomes. We examined genetic diversity, population differentiation and linkage disequilibrium (LD) across the highly disjunct native range of the Australian forest tree Eucalyptus globulus, using 203,337 SNPs genotyped in 136 trees spanning seven races. We found support for four broad genetic groups, with moderate FST, high allelic diversity and genome-wide LD decaying to an r2 of 0.2 within 4 kb on average. These results are broadly similar to those reported previously in Eucalyptus species and support the ‘ring’ model of migration proposed for E. globulus. However, two of the races (Otways and South-eastern Tasmania) exhibited a much slower decay of LD with physical distance than the others and were also the most differentiated and least diverse, which may reflect the effects of selective sweeps and/or genetic bottlenecks experienced in their evolutionary history. We also show that FST and rates of LD vary within and between chromosomes across all races, suggestive of recombination outcomes influenced by genomic features, hybridization or selection. The results obtained from studying this species serve to illustrate the genomic effects of population disjunction and further contribute to the characterisation of genomes of woody genera.

History

Publication title

Tree Genetics & Genomes

Volume

18

Article number

28

Number

28

Pagination

1-18

ISSN

1614-2950

Department/School

School of Natural Sciences

Publisher

Springer

Place of publication

Germany

Rights statement

© 2022. The Authors. This article is licensed under a Creative Commons Attribution 4.0 International (CC BY 4.0) License (https://creativecommons.org/licenses/by/4.0/), which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

Repository Status

  • Open

Socio-economic Objectives

Expanding knowledge in the biological sciences

Usage metrics

    University Of Tasmania

    Exports

    RefWorks
    BibTeX
    Ref. manager
    Endnote
    DataCite
    NLM
    DC